To get things started I'd like to suggest El Vino's.
Now, I have to admit that the last time I was there was 27 years ago when I was one of maybe 100 roaring drunk journalists spending the afternoon getting pissed. But that is no excuse for the service I received today.
We arrived at 2.00. Bar and restaurant emptying. Girl behind bar thinks washing glasses more interesting than talking to/serving us. So we find our own table. She comes over just after I have noticed that "today's specials" are the same as the menu printed and on the website. We order drinks and then fish and chips (me) and pasta of the day (her). No-one asks if we want another drink so I go to the bar and order. Food arrives - mine boring but warm her's shit and cold. I go to the bar and say "my wife's food is cold." Waitress takes it away and comes back 45 seconds later with it steaming. Obviously micro-waved. Still shit now red hot.
Food consumed I ask for the bill. No-one cares if food good or bad. Or brings the bill. So, I go back to the bar. Manager still doesn't ask if food ok. Clearly he doesn't give a shit either - or he knows it is crap and doesn't want to be told again!
Verdict: I think this is the worst restaurant in London. Who can prove me wrong?
